Regex Roulette · #44 · 2026-05-18
Match 24-hour time format (HH:MM)
Difficulty 3/3
How to play
Write a regex that matches all green strings and rejects all red strings. Live feedback shows which strings pass. Shorter patterns score better.
Must match
- 00:00 — not yet evaluated
- 12:30 — not yet evaluated
- 23:59 — not yet evaluated
- 09:05 — not yet evaluated
Must not match
- 24:00 — not yet evaluated
- 12:60 — not yet evaluated
- 9:05 — not yet evaluated
- 12:5 — not yet evaluated
- 25:00 — not yet evaluated
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Pattern body only — slashes and flags (e.g. /g, /i) aren't part of the input.
0/200 chars
Type a regex that matches all green strings and rejects all red strings · Back to hub